Rotary drilling machine



y 23, a E. GREVE a ROTARY DRILLING MACHINE Filid Jan. 23, 1926 Patented July 23, 1929.

: UNITED STATES EDGAR E. GBEVE, F BELLE-WE, PENNSYLVANIA.

ROTARY DRILLING MACHINE. v

Application filed January 23, 1926. Serial No. 83,256. g

. My invention relates to improvements in rotary drilling machines and more particu' larly to new and improved driving members or means employed in machines of this character between the rotary table or gear ring and the drilling string for transmitting power from the machine to the rotatable drill string.

In machines of the type of the present invention, a drive member or spider is disposed in the central opening of the rotary, said spider being designed to receive drive bushings and when desired, pipe slips. This spider or drive member is rotatable with the rotary table or gear ring and through the bushings connects the grief stem ofa string of drilling casin to the rotary.

Among the ob gects of my invention are, to

provide new and improved driving members of the character specified having interlocking elements designed to lock said members together to permit a simultaneous rotary movement thereof and prevent a relative vertical movement; to provide driving members 8 adapted to be nested and of such a character as to provide frictional contact between taering contacting surfaces on the said memers; and to provide a simple and efficient construction including two members having cooperating locking means of a construction permitting the members to be readily engaged and disengaged.

In the accompanying drawings, which illustrate an application of my .invention':

Figure 1 is a top plan view of the spider member included in m invention;

Figure 2, a similar view of a drive bushing member;

Figure '3, a vertical sectional view, the

- 40 section being taken on line III-III of Figare 1;

c Figure 4, a side elevational view of the drive bushing member; and Figure 5, a part elevational and a part sectional view of a rotary drilling machine embodying my invention:

In Figure 5 of the drawings 1 have shown my invention embodied in a rotary drilling machine and I have shown it in connection with a grief. stem A. The rotary maybe of any preferred construction; as illustrated it includes-a rotatable table 5 having a gear ring 6. the latter being coupled with a gear wheel 7 carried on the end of a drive shaft 8.-

9 designates a drive member of the rotary,

this member'being adapted to receive the spiller orbushing carrying member of" the roary. My invention includes a spider or drive bushing carriermember 10. This member as shown and as preferred comprises a body having a tapering centrally disposed bore 11, said bore towards its upper end being slightly enlarged to form an annular ledge or flange 12, a slightly tapering portion 13, and a still further enlarged portion 14.

Formed on and projecting inwardly from the wall 15 of the enlarged'portion 14 of the bore, I rovide a plurality of contact mem here or ogs 16, each member 16 being formed wlth a slightly inclined face a, the latter havmg a slight tapered portion 5. In addition to the member 10 the present invention includes a drive bushing member 17 designed to fit within the tapered bore ofthe carrier 10 with the walls of said members frictionally engaging one another. The bushing member is formed as shown, from a slngle piece of suitable metal and has a central non-circular bore 18 adapted to receive a portion of the non-circular grief stem A. Formed on or secured to the outer surface of the tapered body of the hollow bushing,

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are a number ofprojecting contacting mem bers 19. Members 19 are designed to engage the dogs or members 16 when the bushing is positioned within the member 10. Each member 19 is formed with an inclined and tapered face adapted to engage the face of one ofthe members 16 of the bushing receiving member 10. c designates the inclined contact face corresponding with face a of member 16 and d the ta ered portion.

In assemb ing the members, member 17 is first entered in the bore of member 10 and at then turned counter-clockwise, causing the contactingmember 19 of the bushing to pass under and make engagement with the re in a clockwise direction and thatthe mem- 5 provide a simple an eflicient construction for coking the two members 10 and 17 together,

- but in addition thereto, function to prevent a relative vertical movement of the said memrs. e w- WhatIclaimi's:-

, The combination with a' rotary drilling machine, of a-spider having a tapering-bore;

an enlarged ope above the tapering bore and'a-wedging' loc ing member disposed in 1 theenlarged' portion and a drive' bushing 11 i havingaitapering y and a wedging locking member disposed on the outside of the upper portion ofv the bushing, said bushing entered in the bore of the spider with the lockin member thereof in the enlarged ortion 0 the ider and engaging the loo g member of t e spider, a key insertible be- 7 tween the spider and bushing when the same are in operative position to lock them against a relative, rotative-movement, the construction providing a doublewed spider and'bushing, an the locking member of the bushing serving as a drive means for thespider.

In testimony whereof I aflix my signature.

EDGAR E. GREVE.

aotion between the 

